The viafb_ioctl_get_viafb_info function in drivers/video/via/ioctl.c in the Linux kernel before 2.6.36-rc5 does not properly initialize a certain structure member, which allows local users to obtain potentially sensitive information from kernel stack memory via a VIAFB_GET_INFO ioctl call.

References

• https://nvd.nist.gov/vuln/detail/CVE-2010-4082
• https://bugzilla.redhat.com/show_bug.cgi?id=648671
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca
• http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00000.html
• http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00001.html
• http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00004.html
• http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
• http://lkml.indiana.edu/hypermail//linux/kernel/1009.1/03392.html
• http://secunia.com/advisories/42778
• http://secunia.com/advisories/42801
• http://secunia.com/advisories/42890
• http://secunia.com/advisories/42932
• http://www.kernel.org/pub/linux/kernel/v2.6/testing/v2.6.36/ChangeLog-2.6.36-rc5
• http://www.openwall.com/lists/oss-security/2010/09/25/2
• http://www.openwall.com/lists/oss-security/2010/10/06/6
• http://www.openwall.com/lists/oss-security/2010/10/07/1
• http://www.openwall.com/lists/oss-security/2010/10/25/3
• http://www.redhat.com/support/errata/RHSA-2010-0958.html
• http://www.redhat.com/support/errata/RHSA-2011-0007.html
• http://www.securityfocus.com/bid/43817
• http://www.vupen.com/english/advisories/2011/0012
• http://www.vupen.com/english/advisories/2011/0124
• http://www.vupen.com/english/advisories/2011/0298